/*
 * @copyright 2010 Gerald Jacobson
 * @license GNU General Public License
 * 
 * This file is part of My Quick Rules.
 *
 * My Quick Rules is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * My Quick Rules is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with My Quick Rules.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.amphiprion.myquickrules.util;

import java.util.ArrayList;
import java.util.List;

import org.amphiprion.myquickrules.dao.VersionDao;
import org.amphiprion.myquickrules.entity.Version;

/**
 * @author Amphiprion
 * 
 */
public class GameRuleCheckerRunnable implements Runnable {
	private static GameRuleCheckerRunnable instance;
	private volatile boolean running;
	private List<String> ruleIds;
	private GameRuleUpdateCheckerListener listener;

	/**
	 * 
	 * @param listener
	 */
	private GameRuleCheckerRunnable(GameRuleUpdateCheckerListener listener) {
		this.listener = listener;
		ruleIds = new ArrayList<String>();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Runnable#run()
	 */
	@Override
	public void run() {
		running = true;
		try {
			Thread.sleep(1000);
		} catch (InterruptedException e) {
		}
		while (running) {
			String ruleId = null;
			synchronized (ruleIds) {
				if (ruleIds.size() > 0) {
					ruleId = ruleIds.get(0);
					ruleIds.remove(0);
				} else {
					running = false;
				}
			}
			if (ruleId != null) {
				String url = ConfigUtil.getVersionInformationUrl(ruleId);
				Version vers = VersionDao.getInstance().getVersionInformation(url);
				if (vers != null) {
					listener.checked(ruleId, vers.version);
				}
			}
			try {
				Thread.sleep(100);
			} catch (InterruptedException e) {
			}
		}
	}

	public static void setListener(GameRuleUpdateCheckerListener listener) {
		if (instance == null) {
			instance = new GameRuleCheckerRunnable(listener);
		} else {
			instance.listener = listener;
		}
	}

	public static void addCheck(String ruleId) {
		synchronized (instance.ruleIds) {
			instance.ruleIds.add(ruleId);
			if (!instance.running) {
				instance.running = true;
				new Thread(instance).start();
			}
		}
	}

	public interface GameRuleUpdateCheckerListener {
		void checked(String ruleId, String availableVersion);
	}
}
